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Valvetrain Talk

OMGGTR

By OMGGTR,
in Engines & Forced Induction

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kitto Mentor

kitto

Posted
Posted

question still stands can i use tomei solid lifters with 9.15mm lift cam ? if i get some yesses or no's i can look into something different or purchase..

No, you wouldn't use them as you dont have small base circle cams.

They are suited to 'Tomei' cams with more than 10.25mm lift.

kitto Mentor

kitto

Posted
Posted

So is there a aftermarket lifter to use with a 9.15mm lift cam?

Not required... The smaller lift camshafts use the same base circle diameter as the factory cams. In other words they are machined 'the same'. So they are not required. Just make sure they are in good condition and you have adjusted the valve clearances correctly.

zebra Grand Master

zebra

Posted
Posted

I would be wary about the ramp rates being 270s, maybe a little more spring pre-load you could get away with them

But with 270s you would want to rev a 25 pretty hard to take advantage of them, or is it for your 30?

zebra Grand Master

zebra

Posted
Posted

well you're handy on the spanners, give it a go, not a big job to pull the cams back out if it floats

Off the top of my head all the 270 results ive seen had springs, but they all had more lift than what you do.

p.s didnt you score some camtech 272s a while back? (was flipping through an old Zoom mag yesterday)

  • 3 weeks later...
Gerg_R31 Mentor

Gerg_R31

Posted
Posted

Correct term is 'under bucket shim' (and there is 'over bucket shim' & 'solid bucket')

Rb26 clearances - 0.018" ( +/- 0.001") intake & 0.015" exhaust ( +/- 0.001")

Measure with feeler gauges when the cam lobes base circle is above the bucket

Face valve/ cut seat/ order thicker shims to close the gaps

Machine tip of valve/ shim to open

Too loose it will rattle and cause premature wear

too tight it will stay open causing loss of compression

I've had to machine a 26 head out for poncams a couple times

try reading the whole thread

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